It's called rotation. use one till the batteries run out put the batteries on charge use another mod and so on. or in mine and a few others cases use a few set ups with different flavours and use the same principle previously described.
Some may have a favourite mod to use which will remain a constant. then there's the different horses for different courses way of doing things, so that will be on what tank, dripper is being used and what power it requires to what mod it is used with, so an higher ohm built atomizer may go on a single cell mod and a lower ohm that needs more power on a duel battery mod, or if going out for the day a higher ohm build with a duel or triple battery mod so you can last the day without carrying spare batteries finally we have styles, regulated mod, regulated squonker, mech squonker mech tube, mech box series mech. All of which keeps things interesting. Not for everyone as some like to stick with something tried and tested